Details:
1) RGB leds
2) Encoder
3) OLED display 

Config for Arduino Nano
RGB_leds
pins:
    DIN - D7 (через небольшой резистор)
    5V - 5V
    GND - GND

Encoder
pins:
    GND - GND
    S1 (DT) - D10
    S2 (CLK)- D9
    KEY (SW)- D8
    5V - 5V

OLED (library on https://github.com/jlegas/OLED_I2C)
pins:
    GND - GND
    VCC - 5V
    SDL - A5
    SDA - A4